The Ontario Building Code | Heated and Unheated Crawl Spaces
9.18.1.3. Heated and Unheated Crawl Spaces
(1) Crawl spaces shall be considered to be heated where the space,
(a) is used as a warm air plenum,
(b) contains heating ducts or heating pipes that are not sealed and insulated to minimize heat loss to the space, or
(c) is not separated from heated space in accordance with Section 9.25.
(2) Heating of heated crawl spaces shall conform to Section 9.33.
(3) insulationhttp://thehandyforce.com/insulation/" title ="Toronto home insulation">insulation, an air barrier system and a vapour barrier shall be installed in the walls of heated crawl spaces in accordance with Section 9.25.
9.18.2. Access
In Plain Language
Both heated and unheated crawl spaces have specific requirements set out in this article, since a heated crawl space is treated more like conditioned living space.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.